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Michael Phelps
Michael Phelps competed at five Olympic Games between 2004 and 2016 and finished with 28 total medals, 23 of them gold — both figures the most of any Olympian in any sport in the history of the Games, and by a margin so large that no other athlete's total is realistically within reach of either record. His most dominant single Games came in Beijing in 2008, where he won eight gold medals, breaking Mark Spitz's 1972 record of seven golds in a single Olympics. One of those eight, the 4x100m medley relay, came down to a margin of one-hundredth of a second, the closest possible finish in Olympic swimming. Phelps's core events were the butterfly and individual medley, disciplines that reward an unusually broad combination of strength, technique, and endurance across different strokes, and his 6-foot-7 wingspan paired with a comparatively short torso gave him a widely discussed physical advantage in the water that biomechanics researchers have studied extensively since. Phelps retired for good after the 2016 Rio Games and became an outspoken advocate for athlete mental health afterward, discussing his own struggles with depression following major competitions — a topic that's since become a more openly acknowledged part of elite athletes' post-Olympic experience.
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Simone Biles
Simone Biles has won more world and Olympic medals combined than any gymnast in history, a career built across the 2016, 2020 (held in 2021), and 2024 Olympics along with more than a decade of World Championship dominance, and she's widely regarded as having permanently raised the sport's technical ceiling. Biles has five skills named after her across four different apparatuses — a rule requiring a gymnast to land a new skill cleanly at a major competition before it can bear their name — a total no other gymnast, male or female, has matched, reflecting a level of difficulty she's introduced that judges and rivals alike have had to adjust to. At the 2020 Tokyo Olympics, Biles withdrew from several event finals after experiencing "the twisties," a disorienting loss of spatial awareness mid-air that made continuing dangerous, and her public explanation of the condition and prioritization of her own safety became a widely discussed moment for athlete mental health in elite sport. She returned at the 2024 Paris Olympics to win three more gold medals, a comeback that added to an already record-setting medal count and reinforced her case, already strong before Tokyo, as the most statistically dominant gymnast the sport has ever produced.
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